This would all be correct, if you were running ONE gear. That's why we have transmissions in front of the differential. You can use a MUCH narrower torque curve, which is easier to make more power across a narrower RPM range (we can ALL agree on that can't we??? Maybe not) and use multiple gears (which is why 5 speeds are faster than 4, even in Pro Stock...and you can ask Wayne County about this...they were the LAST PS car of the era to go to a 5 speed...I actually asked them about why they had not gone to the 5 speed in front of a pretty good crowd and was told they use a longer stroke and a flatter torque curve to make up the difference...as they were barely qualified at that time and had been stinking it up for a while